hd1 unclamps during transfer before hd2 finishes clamping

Our machine is Integrex 200-IV ST Matrix. I was told that hd1 unclamps during transfer before hd2 finishes clamping onto the part. I was told it's been doing this for a long time maybe as long as we've had the machine. Any ideas on what would cause this and what will fix it. It's on mazatrol programs. We don't program eia on this machine.